CA Health & Safety Code Section 18871.5

(a)

No recreational vehicle within a park shall be rented or leased unless it bears a label, an insignia, or an insignia of approval required by Section 18027.3.

(b)

A recreational vehicle that does not bear a label, an insignia, or an insignia of approval, as required by subdivision (f) or (g) of Section 18027.3, may not occupy any lot in a park unless the vehicle owner provides reasonable proof of compliance with ANSI Standard No. A119.2 or A119.5 depending upon whether it is a recreational vehicle or park trailer. A department label or insignia shall constitute one form of reasonable proof of compliance with ANSI standards. This subdivision does not apply to a recreational vehicle occupying a lot in a special occupancy park on December 31, 1998, unless the vehicle is moved to a different park on or after January 1, 1999.